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CVE-2024-36963— Linux kernel 安全漏洞

一分钟漏洞结论

影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 tracefs 中存在安全问题。

CVSS 7.8 · High EPSS 0.19% · P8

可能的 ATT&CK 技术 1 AI

T1222.001 · Windows Permissions

影响版本矩阵 11

厂商产品 版本范围状态
Linux Linux 628adb842bd5e1c2c598534a7a022b8235289de6< 5f91fc82794d4a6e41cdcd02d00baa377d94ca78 affected
8186fff7ab649085e2c60d032d9a20a85af1d87c< 414fb08628143203d29ccd0264b5a83fb9523c03 affected
8186fff7ab649085e2c60d032d9a20a85af1d87c< baa23a8d4360d981a49913841a726edede5cdd54 affected
9c2ac5e0ea7899411fd900d4681890722a020735 affected
6.6.18< 6.6.31 affected
6.7.4< 6.8 affected
6.8 affected
< 6.8 unaffected
… +3 条更多
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一、 漏洞 CVE-2024-36963 基础信息

漏洞信息
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Vulnerability Title
tracefs: Reset permissions on remount if permissions are options
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tracefs: Reset permissions on remount if permissions are options There's an inconsistency with the way permissions are handled in tracefs. Because the permissions are generated when accessed, they default to the root inode's permission if they were never set by the user. If the user sets the permissions, then a flag is set and the permissions are saved via the inode (for tracefs files) or an internal attribute field (for eventfs). But if a remount happens that specify the permissions, all the files that were not changed by the user gets updated, but the ones that were are not. If the user were to remount the file system with a given permission, then all files and directories within that file system should be updated. This can cause security issues if a file's permission was updated but the admin forgot about it. They could incorrectly think that remounting with permissions set would update all files, but miss some. For example: # cd /sys/kernel/tracing # chgrp 1002 current_tracer # ls -l [..] -rw-r----- 1 root root 0 May 1 21:25 buffer_size_kb -rw-r----- 1 root root 0 May 1 21:25 buffer_subbuf_size_kb -r--r----- 1 root root 0 May 1 21:25 buffer_total_size_kb -rw-r----- 1 root lkp 0 May 1 21:25 current_tracer -rw-r----- 1 root root 0 May 1 21:25 dynamic_events -r--r----- 1 root root 0 May 1 21:25 dyn_ftrace_total_info -r--r----- 1 root root 0 May 1 21:25 enabled_functions Where current_tracer now has group "lkp". # mount -o remount,gid=1001 . # ls -l -rw-r----- 1 root tracing 0 May 1 21:25 buffer_size_kb -rw-r----- 1 root tracing 0 May 1 21:25 buffer_subbuf_size_kb -r--r----- 1 root tracing 0 May 1 21:25 buffer_total_size_kb -rw-r----- 1 root lkp 0 May 1 21:25 current_tracer -rw-r----- 1 root tracing 0 May 1 21:25 dynamic_events -r--r----- 1 root tracing 0 May 1 21:25 dyn_ftrace_total_info -r--r----- 1 root tracing 0 May 1 21:25 enabled_functions Everything changed but the "current_tracer". Add a new link list that keeps track of all the tracefs_inodes which has the permission flags that tell if the file/dir should use the root inode's permission or not. Then on remount, clear all the flags so that the default behavior of using the root inode's permission is done for all files and directories.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 tracefs 中存在安全问题。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
Linux Linux 628adb842bd5e1c2c598534a7a022b8235289de6 ~ 5f91fc82794d4a6e41cdcd02d00baa377d94ca78 -
Linux Linux 6.8 -

二、漏洞 CVE-2024-36963 的公开POC

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三、漏洞 CVE-2024-36963 的情报信息

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CVE-2024-36963 其他参考 (3)

同批安全公告 · Linux · 2024-06-03 · 共 5 条

CVE-2024-36964 8.8 HIGH Linux kernel 安全漏洞
CVE-2024-36961 7.8 HIGH Linux kernel 安全漏洞
CVE-2024-36962 7.5 HIGH Linux kernel 安全漏洞
CVE-2024-36960 7.1 HIGH Linux kernel 安全漏洞

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-36963

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